EP2316361B1 - Cone tip obturator - Google Patents
Cone tip obturator Download PDFInfo
- Publication number
- EP2316361B1 EP2316361B1 EP11154547.1A EP11154547A EP2316361B1 EP 2316361 B1 EP2316361 B1 EP 2316361B1 EP 11154547 A EP11154547 A EP 11154547A EP 2316361 B1 EP2316361 B1 EP 2316361B1
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- EP
- European Patent Office
- Prior art keywords
- tip
- obturator
- rectangle
- surgical obturator
- sections
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/34—Trocars; Puncturing needles
- A61B17/3417—Details of tips or shafts, e.g. grooves, expandable, bendable; Multiple coaxial sliding cannulas, e.g. for dilating
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/02—Surgical instruments, devices or methods, e.g. tourniquets for holding wounds open; Tractors
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/34—Trocars; Puncturing needles
- A61B17/3498—Valves therefor, e.g. flapper valves, slide valves
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M13/00—Insufflators for therapeutic or disinfectant purposes, i.e. devices for blowing a gas, powder or vapour into the body
- A61M13/003—Blowing gases other than for carrying powders, e.g. for inflating, dilating or rinsing
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/32—Surgical cutting instruments
- A61B2017/320044—Blunt dissectors
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/34—Trocars; Puncturing needles
- A61B17/3417—Details of tips or shafts, e.g. grooves, expandable, bendable; Multiple coaxial sliding cannulas, e.g. for dilating
- A61B2017/3454—Details of tips
- A61B2017/3456—Details of tips blunt
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/34—Trocars; Puncturing needles
- A61B17/3417—Details of tips or shafts, e.g. grooves, expandable, bendable; Multiple coaxial sliding cannulas, e.g. for dilating
- A61B2017/3454—Details of tips
- A61B2017/346—Details of tips with wings
Definitions
- This invention generally relates to trocar systems including obturators and, more specifically, to blunt cone tip obturators.
- Trocar systems have been of particular advantage in facilitating less invasive surgery across a body wall and within a body cavity. This is particularly true in the case of the abdominal surgery where trocars have provided working channels across the abdominal wall to facilitate the use of instruments within the abdominal cavity.
- the trocar systems of the past typically include a cannula, which defines the working channel, and an obturator which is used to place the cannula across the abdominal wall.
- the obturator is inserted into the working channel of the cannula and then pushed through the abdominal wall with a penetration force of sufficient magnitude to result in penetration of the abdominal wall. Once the cannula is in place, the obturator can be removed.
- obturators have been developed with an intent to provide a reduction in the force required for penetration.
- Sharp blades have typically been used to enable the obturator to cut its way through the abdominal wall. While the blades have facilitated a reduced penetration force, they have been of particular concern once the abdominal wall has been penetrated.
- shields have been provided with the obturators in order to sense penetration of the abdominal wall and immediately shield the sharp blades.
- Blunt-tip obturators have been contemplated with both symmetrical and asymmetrical designs. While the blunt tip tends to inhibit damage to interior organs, it also tends to increase the penetration force associated with the obturator. Thus, there is a need in the art for an improved bladeless obturator that reduces the force required to place the obturator across the abdominal wall.
- Document WO-03/02 6512 which is a document falling under Article 54(3) EPC discloses a bladeless obturator.
- Document WO-00/54648 discloses an obturastor having a conical tip with side blades and a blunt end.
- a surgical obturator adapted to penetrate at least two consecutive layers of muscle tissue including a first layer of muscle tissue having fibers oriented in a first direction and a second layer of muscle tissue having fibers oriented in a second direction
- the obturator comprising: an elongate shaft extending along an axis between a proximal end and a distal end; and a bladeless tip disposed at the distal end of the shaft; the tip having an outer surface extending distally to a blunt end (62); the outer surface including a pair of side surfaces separated by intermediate surfaces defining a rectangle in radial cross-sections of the tip; wherein the outer surface is configured such that the rectangle at the distal end of the tip is in a more parallel alignment with the second direction of orientation of fibers of the second layer of muscle tissue after penetration of the first layer of muscle tissue along the first direction of orientation of fibers, characterized in that the outer surface further includes a conical surface extending distally to the blunt
- the blunt tip obturator of the invention is similar to that described in international application No. PCT/US02/06759 , published as WO-03/026512 , but further including a cone at its distal tip with conical surfaces extending distally to the blunt end, the cone having characteristics that reduce the force required to penetrate the abdominal wall. The addition of the cone also reduces the tendency for the abdominal wall and the peritoneum to deflect or "tent" during insertion of the obturator.
- the blunt cone tip obturator of the invention penetrates and twists radially from a distal end to a proximal end of the tip.
- the blunt cone tip obturator facilitates insertion with a reduced penetration force as the user moves the tip back and forth radially while applying an axial penetration force.
- the blunt cone tip obturator can be directed and inserted between the fibers and then rotated to provide increased penetration and fiber separation.
- a trocar system is illustrated in FIG. 1 and is designated by reference numeral 10.
- This system includes a cannula 12, defining a working channel 14, and a valve housing 16.
- the system 10 also includes an obturator 18 having a shaft 21 extending along an axis 23.
- a handle 25 is disposed at a proximal end of the shaft at 21 while a blunt cone tip 27 is disposed at a distal end of the shaft 21.
- the shaft 21 of the obturator 18 is sized and configured for disposition within the working channel 14 of the cannula 12.
- the obturator 18 can be directed to penetrate a body wall such as the abdominal wall to provide the cannula 12 with access across the wall and into a body cavity, such as the peritoneal or abdominal cavity.
- the blunt cone tip 27 serves to direct the obturator 18 through the abdominal wall and the peritoneum, and can be removed with the obturator 18 once the cannula 12 is operatively disposed with the working channel 14 extending into the abdominal cavity.
- a penetration force represented by an arrow 34
- the force required to penetrate the abdominal wall drops significantly once the wall is penetrated. Further application of the force 34, even for an instant of time, can result in injury to organs within the cavity. Where the obturators of the past have included blades facilitating penetration of the abdominal wall, these blades have been particularly threatening and detrimental to the interior organs.
- the tip 27 is provided with a blunt cone configuration.
- Blunt tips have been used in the past to reduce any potential for damage to interior organs. However, these blunt tips have increased the amount of force 34 required for penetration of the abdominal wall.
- the blunt cone tip 27 of the present invention takes into account the anatomical configuration of the abdominal wall with an improved structural design and method of insertion.
- the abdominal wall typically includes a skin layer and a series of muscle layers.
- the muscle layers are each defined by muscle fibers that extend generally parallel to each other in a direction that is different for each of the layers.
- fibers of a first muscle layer and a second muscle layer may extend in directions that are 45 degrees off of each other.
- the obturator of the present invention reduces the penetration force 34 required to push the obturator 18 through a particular layer.
- the fibers of the muscle layers may be oriented at different angles to each other such that proper alignment of the tip 27 for penetration of one layer may not necessarily result in proper alignment for penetration of the next layer.
- the obturator 18 has a blunt cone tip 27 to direct the obturator 18 through the different layers and a rectangular configuration that is twisted slightly so that penetration of a first layer begins to rotate the distal end of the blunt cone tip 27 into proper orientation for penetration of the next layer.
- the twisted configuration of the blunt cone tip 27 also causes the blunt cone tip 27 to function with the mechanical advantage of a screw thread.
- a preferred method of placement requires that the user grip the handle 25 of the obturator 18 and twist it about the axis 23.
- This twisting motion in combination with the screw configuration of the blunt cone tip 27 converts radial movement into forward movement along the axis 23.
- the user applies both a forwardly directed force as well as a radial force to move the trocar system 10 in a forward direction. Since all of the force supplied by the user is not directed axially along the arrow 34, this concept avoids the tendency of prior trocar systems to jump forward upon penetration of the abdominal wall.
- the blunt cone tip 27 comprises generally of eight surfaces: two opposing surfaces 50 and 52, separated by two side surfaces 54 and 56, two end surfaces 58 and 59, a conical surface 60 formed in surfaces 50 and 52 around axis 23 and extending beyond end surfaces 58 and 59, and a blunt surface 62.
- a plane drawn through the axis 23 would show the tip 27 to be composed of two symmetrical halves.
- the surfaces 50 and 52, side surfaces 54 and 56, and conical surface 60 generally define the cross section of the blunt cone tip 27 from blunt surface 62 to proximal end 61. This configuration can best be appreciated with reference to the cross section views of FIGS. 4-9 .
- the distal end of the blunt cone tip 27 is shown with a circle 64 having the smallest circular area and a rectangle 63 having the greatest length-to-width ratio.
- the rectangle 63 has a twisted, S-shaped configuration at end surfaces 58 and 59.
- the circle 64 becomes larger and the rectangle 63 becomes less twisted, and the width increases relative to the length of the rectangle 63.
- the spiral nature of the blunt cone tip 27 is also apparent as the circle 64 and rectangle 63 move counterclockwise around the axis 23. This is perhaps best appreciated in a comparison of the circle 64 and the rectangle 63 in FIG. 6 relative to that in FIG. 5 .
- the circle 64 begins to expand with increasing circular area and the rectangle 63 begins to widen with a reduction in the ratio of length to width.
- the long sides of the rectangle 63 also tend to become more arcuate as they approach a more rounded configuration most apparent in FIGS. 8 and 9 .
- the circle 64 and the rounded rectangle 63 become more concentric with progressive proximal positions. Furthermore, the circle 64 expands at a lesser rate than the rectangle 63, which eventually absorbs the circle 64 as shown in FIGS. 8 and 9 . In these figures, it will also be apparent that the rotation of the rectangle 63 reaches a most counterclockwise position and then begins to move clockwise. This is best illustrated in FIGS. 7-9 . This back and forth rotation results from the configuration of the side surfaces 54 and 56, which in general are U-shaped as best illustrated in FIGS. 2 and 3 .
- the ratio of the length to width of the rectangle 63 is dependent on the configuration of the side surfaces 54 and 56, which define the short sides of the rectangle 63 as well as the configuration of the surfaces 50 and 52, which define the long sides of the rectangle 63.
- the side surfaces 54 and 56 are most narrow at the end surfaces 58 and 59.
- the side surfaces 54 and 56 extend proximally, they reach a maximum width near the point of the most counterclockwise rotation, shown generally in FIG. 8 , and then reduce in width as they approach the proximal end 61.
- the surfaces 50 and 52 transition from a generally flat configuration at the end surfaces 58 and 59 to a generally rounded configuration at the proximal end 61.
- the circle 64 is further designated with a lower case letter a, b or c, respectively; similarly, the rectangle 63 is further designated with a lower case letter a, b, c, d or e, respectively, in FIGS. 5-9 .
- the circles 64, 64a-64c and the rectangles 63, 63a-63e are superimposed on the axis 23 to show their relative sizes, shapes and angular orientations.
- a preferred method of operating the trocar system 10 benefits significantly from this preferred shape of the blunt cone tip 27.
- the tip 27 appears much like a flathead screwdriver having a cone at its tip.
- the blunt tip includes a conical structure extending outward from the end surfaces 58 and 59 that serves to direct the obturator through the abdominal wall and peritoneum.
- the cone tip has a radius of approximately 0.64 mm (0.025"). The incorporation of the cone onto the rectangular configuration reduces the insertion force required to traverse the abdominal wall.
- An advantage of the obturator of the invention is it provides a safer and more controlled entry of the abdominal cavity.
- the lengths of the end surfaces 58 and 59 are aligned parallel with the fibers of each muscle layer.
- the blunt cone tip can be used to locate or pinpoint a desired location and penetrate the abdominal wall.
- a simple back and forth twisting motion of the blunt cone tip tends to separate the fibers along natural lines of separation, opening the muscle layer to accept the larger diameter of the cannula 12.
- the conical and twisted configuration of the blunt cone tip 27 directs and turns the rectangle 63 more into a parallel alignment with fibers in the next layer.
- the blunt cone tip facilitates penetration, and the twisting or dithering motion facilitates an easy separation of the fibers requiring a significantly reduced penetration and insertion force along the arrow 34.
- the blunt cone tip 27 is bladeless and atraumatic to organs and bowel within the peritoneal or abdominal cavity.
- the blunt cone tip 27 also minimizes tenting of the peritoneum and allows for a safe entry.
- the device is typically used in conjunction with the cannula 12 to create an initial entryway into the peritoneal cavity.
- the obturator 18 is first inserted through the valve housing 16 and into the cannula 12.
- the entire trocar system 10 is then inserted through the abdominal wall and into the peritoneal cavity. Once the cannula 12 is properly placed, the obturator 18 can be removed.
- the invention facilitates a unique method of penetrating and separating tissue and could apply to any object with a blunt cone tip and generally flat sides.
- the blunt cone tip When inserted into the peritoneum the blunt cone tip requires very little area to move safely between tissue and muscle fibers.
- the device can then be rotated in alternating clockwise and counterclockwise directions while the downward penetration force is applied. When rotated in alternating directions, the tissue is moved apart and a larger opening is created for a profile of greater cross sectional area to follow. This process continues with safety as the device enters the peritoneal cavity and moves to its operative position.
- the size of the opening left in the tissue is minimal. Importantly, this opening is left sealed due to a dilating effect caused by the mere separation of fibers. Since there are no blades or sharp edges to cut muscle fiber, the healing process is significantly shortened.
- the obturator 18 can be constructed as a single component or divided into multiple components such as the shaft 21 and the blunt cone tip 27. If the obturator 18 is constructed as a single component, it may be constructed of either disposable or reusable materials. If the obturator 18 is constructed as two or more components, each component can be made either disposable or reusable as desired for a particular configuration. In a preferred embodiment, the obturator is constructed as a single component made from a reusable material such as metal (e.g., stainless steel) or an autoclavable polymer to facilitate re-sterilization.
- a reusable material such as metal (e.g., stainless steel) or an autoclavable polymer to facilitate re-sterilization.
- the blunt cone tip 27 can be coated or otherwise constructed from a soft elastomeric material.
- the material could be a solid elastomer or composite elastomer/polymer.
- the shaft 21 of the obturator 18 could be partially or fully flexible. With this configuration, the obturator 18 could be inserted through a passageway containing one or more curves of virtually any shape. A partially or fully flexed obturator 18 could then be used with a flexible cannula 12 allowing greater access to an associated body cavity.
- the obturator 18 could also be used as an insufflation needle and provided with a passageway and valve to administer carbon dioxide or other insufflation gas to the peritoneal cavity.
- the obturator 18 could also be used with an insufflation needle cannula, in which case removal of the obturator 18 upon entry would allow for rapid insufflation of the peritoneal cavity.
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Description
- This invention generally relates to trocar systems including obturators and, more specifically, to blunt cone tip obturators.
- Trocar systems have been of particular advantage in facilitating less invasive surgery across a body wall and within a body cavity. This is particularly true in the case of the abdominal surgery where trocars have provided working channels across the abdominal wall to facilitate the use of instruments within the abdominal cavity.
- The trocar systems of the past typically include a cannula, which defines the working channel, and an obturator which is used to place the cannula across the abdominal wall. The obturator is inserted into the working channel of the cannula and then pushed through the abdominal wall with a penetration force of sufficient magnitude to result in penetration of the abdominal wall. Once the cannula is in place, the obturator can be removed.
- In the past, obturators have been developed with an intent to provide a reduction in the force required for penetration. Sharp blades have typically been used to enable the obturator to cut its way through the abdominal wall. While the blades have facilitated a reduced penetration force, they have been of particular concern once the abdominal wall has been penetrated. Within the abdominal cavity, there are organs which need to be protected against any puncture by an obturator.
- In some cases, shields have been provided with the obturators in order to sense penetration of the abdominal wall and immediately shield the sharp blades.
- These shielding systems have been very complex, have required a large amount of time to deploy, and have generally been ineffective in protecting the organs against the sharp blades.
- Blunt-tip obturators have been contemplated with both symmetrical and asymmetrical designs. While the blunt tip tends to inhibit damage to interior organs, it also tends to increase the penetration force associated with the obturator. Thus, there is a need in the art for an improved bladeless obturator that reduces the force required to place the obturator across the abdominal wall.
- Document
WO-03/02 6512 WO-00/54648 - In accordance with the present invention, there is provided a surgical obturator adapted to penetrate at least two consecutive layers of muscle tissue including a first layer of muscle tissue having fibers oriented in a first direction and a second layer of muscle tissue having fibers oriented in a second direction, the obturator comprising: an elongate shaft extending along an axis between a proximal end and a distal end; and a bladeless tip disposed at the distal end of the shaft; the tip having an outer surface extending distally to a blunt end (62); the outer surface including a pair of side surfaces separated by intermediate surfaces defining a rectangle in radial cross-sections of the tip; wherein the outer surface is configured such that the rectangle at the distal end of the tip is in a more parallel alignment with the second direction of orientation of fibers of the second layer of muscle tissue after penetration of the first layer of muscle tissue along the first direction of orientation of fibers, characterized in that the outer surface further includes a conical surface extending distally to the blunt end.
- The blunt tip obturator of the invention is similar to that described in international application No.
PCT/US02/06759 , published asWO-03/026512 - These and other features and advantages of the invention will become more apparent with a discussion of preferred embodiments in reference to the associated drawings.
-
-
FIG. 1 illustrates side views of a trocar system including a cannula with associated valve housing, and an obturator with a blunt cone tip extending through the working channel of the cannula to facilitate placement across the abdominal wall; -
FIG. 2 is a side elevation view of the blunt cone tip of a preferred embodiment of the invention; -
FIG. 3 is a side elevation view of the blunt cone tip taken along line 3-3 ofFIG. 2 ; -
FIG. 4 is an end view taken along line 4-4 ofFIG. 2 ; -
FIG. 5 is a radial cross-section view taken along line 5-5 ofFIG. 2 ; -
FIG. 6 is a radial cross-section view taken along line 6-6 ofFIG. 2 ; -
FIG. 7 is a radial cross-section view taken along line 7-7 ofFIG. 2 ; -
FIG. 8 is a radial cross-section view taken along line 8-8 ofFIG. 2 ; -
FIG. 9 is a radial cross-section view taken along line 9-9 ofFIG. 2 ; and -
FIG. 10 is a schematic view illustrating each of theFIGS. 4-9 super-imposed to facilitate an understanding of the blunt cone tip and its twisted configuration. - A trocar system is illustrated in
FIG. 1 and is designated byreference numeral 10. This system includes acannula 12, defining a workingchannel 14, and avalve housing 16. Thesystem 10 also includes anobturator 18 having ashaft 21 extending along anaxis 23. Ahandle 25 is disposed at a proximal end of the shaft at 21 while ablunt cone tip 27 is disposed at a distal end of theshaft 21. Theshaft 21 of theobturator 18 is sized and configured for disposition within the workingchannel 14 of thecannula 12. With this disposition, theobturator 18 can be directed to penetrate a body wall such as the abdominal wall to provide thecannula 12 with access across the wall and into a body cavity, such as the peritoneal or abdominal cavity. Theblunt cone tip 27 serves to direct theobturator 18 through the abdominal wall and the peritoneum, and can be removed with theobturator 18 once thecannula 12 is operatively disposed with the workingchannel 14 extending into the abdominal cavity. - In order to facilitate penetration of the abdominal wall by the
trocar system 10, a penetration force, represented by anarrow 34, is typically applied along theaxis 23. It can be appreciated that the force required to penetrate the abdominal wall drops significantly once the wall is penetrated. Further application of theforce 34, even for an instant of time, can result in injury to organs within the cavity. Where the obturators of the past have included blades facilitating penetration of the abdominal wall, these blades have been particularly threatening and detrimental to the interior organs. - Consequently, in accordance with the present invention, the
tip 27 is provided with a blunt cone configuration. Blunt tips have been used in the past to reduce any potential for damage to interior organs. However, these blunt tips have increased the amount offorce 34 required for penetration of the abdominal wall. Theblunt cone tip 27 of the present invention takes into account the anatomical configuration of the abdominal wall with an improved structural design and method of insertion. - To fully appreciate these aspects of this invention, it is helpful to initially discuss the anatomy associated with the abdominal wall. The abdominal wall typically includes a skin layer and a series of muscle layers. The muscle layers are each defined by muscle fibers that extend generally parallel to each other in a direction that is different for each of the layers. For example, fibers of a first muscle layer and a second muscle layer may extend in directions that are 45 degrees off of each other.
- Having noted the directional nature of the muscle fibers, it can be appreciated that such a structure is most easily penetrated by an obturator having a blunt cone tip. The blunt cone tip also has a rectangular and twisted configuration so as to provide better movement between the muscle layers. That is, the blunt cone tip is capable of being moved generally parallel to and between the fibers associated with a particular muscle layer. As a result, the obturator of the present invention reduces the
penetration force 34 required to push theobturator 18 through a particular layer. - As described earlier, the fibers of the muscle layers may be oriented at different angles to each other such that proper alignment of the
tip 27 for penetration of one layer may not necessarily result in proper alignment for penetration of the next layer. For at least this reason, theobturator 18 has ablunt cone tip 27 to direct theobturator 18 through the different layers and a rectangular configuration that is twisted slightly so that penetration of a first layer begins to rotate the distal end of theblunt cone tip 27 into proper orientation for penetration of the next layer. - The twisted configuration of the
blunt cone tip 27 also causes theblunt cone tip 27 to function with the mechanical advantage of a screw thread. With this configuration, a preferred method of placement requires that the user grip thehandle 25 of theobturator 18 and twist it about theaxis 23. This twisting motion in combination with the screw configuration of theblunt cone tip 27 converts radial movement into forward movement along theaxis 23. Thus, the user applies both a forwardly directed force as well as a radial force to move thetrocar system 10 in a forward direction. Since all of the force supplied by the user is not directed axially along thearrow 34, this concept avoids the tendency of prior trocar systems to jump forward upon penetration of the abdominal wall. - The twisted configuration of the
blunt cone tip 27 is most apparent in the side elevation views ofFIGS. 2 and3 . In this embodiment, theblunt cone tip 27 comprises generally of eight surfaces: two opposingsurfaces side surfaces end surfaces conical surface 60 formed insurfaces axis 23 and extending beyond end surfaces 58 and 59, and ablunt surface 62. A plane drawn through theaxis 23 would show thetip 27 to be composed of two symmetrical halves. - The
surfaces conical surface 60 generally define the cross section of theblunt cone tip 27 fromblunt surface 62 toproximal end 61. This configuration can best be appreciated with reference to the cross section views ofFIGS. 4-9 . InFIG. 4 , the distal end of theblunt cone tip 27 is shown with acircle 64 having the smallest circular area and arectangle 63 having the greatest length-to-width ratio. Therectangle 63 has a twisted, S-shaped configuration at end surfaces 58 and 59. - As views are taken along progressive proximal cross sections, it can be seen that the
circle 64 becomes larger and therectangle 63 becomes less twisted, and the width increases relative to the length of therectangle 63. The spiral nature of theblunt cone tip 27 is also apparent as thecircle 64 andrectangle 63 move counterclockwise around theaxis 23. This is perhaps best appreciated in a comparison of thecircle 64 and therectangle 63 inFIG. 6 relative to that inFIG. 5 . With progressive proximal positions, thecircle 64 begins to expand with increasing circular area and therectangle 63 begins to widen with a reduction in the ratio of length to width. The long sides of therectangle 63 also tend to become more arcuate as they approach a more rounded configuration most apparent inFIGS. 8 and 9 . That is, thecircle 64 and therounded rectangle 63 become more concentric with progressive proximal positions. Furthermore, thecircle 64 expands at a lesser rate than therectangle 63, which eventually absorbs thecircle 64 as shown inFIGS. 8 and 9 . In these figures, it will also be apparent that the rotation of therectangle 63 reaches a most counterclockwise position and then begins to move clockwise. This is best illustrated inFIGS. 7-9 . This back and forth rotation results from the configuration of the side surfaces 54 and 56, which in general are U-shaped as best illustrated inFIGS. 2 and3 . - The ratio of the length to width of the
rectangle 63 is dependent on the configuration of the side surfaces 54 and 56, which define the short sides of therectangle 63 as well as the configuration of thesurfaces rectangle 63. Again with reference toFIGS. 2 and3 , it can be seen that the side surfaces 54 and 56 are most narrow at the end surfaces 58 and 59. As the side surfaces 54 and 56 extend proximally, they reach a maximum width near the point of the most counterclockwise rotation, shown generally inFIG. 8 , and then reduce in width as they approach theproximal end 61. Along this same distal to proximal path, thesurfaces proximal end 61. - In the progressive views of
FIGS. 5-7 , thecircle 64 is further designated with a lower case letter a, b or c, respectively; similarly, therectangle 63 is further designated with a lower case letter a, b, c, d or e, respectively, inFIGS. 5-9 . InFIG. 10 , thecircles rectangles axis 23 to show their relative sizes, shapes and angular orientations. - A preferred method of operating the
trocar system 10 benefits significantly from this preferred shape of theblunt cone tip 27. With a conical configuration at the distal point and a rectangular configuration at a distal portion of the tip, thetip 27 appears much like a flathead screwdriver having a cone at its tip. Specifically, the blunt tip includes a conical structure extending outward from the end surfaces 58 and 59 that serves to direct the obturator through the abdominal wall and peritoneum. The cone tip has a radius of approximately 0.64 mm (0.025"). The incorporation of the cone onto the rectangular configuration reduces the insertion force required to traverse the abdominal wall. An advantage of the obturator of the invention is it provides a safer and more controlled entry of the abdominal cavity. - It is preferable that the lengths of the end surfaces 58 and 59 are aligned parallel with the fibers of each muscle layer. With this shape, the blunt cone tip can be used to locate or pinpoint a desired location and penetrate the abdominal wall. A simple back and forth twisting motion of the blunt cone tip tends to separate the fibers along natural lines of separation, opening the muscle layer to accept the larger diameter of the
cannula 12. By the time the first layer is substantially penetrated, the conical and twisted configuration of theblunt cone tip 27 directs and turns therectangle 63 more into a parallel alignment with fibers in the next layer. Again, the blunt cone tip facilitates penetration, and the twisting or dithering motion facilitates an easy separation of the fibers requiring a significantly reduced penetration and insertion force along thearrow 34. - It should be further noted that the
blunt cone tip 27 is bladeless and atraumatic to organs and bowel within the peritoneal or abdominal cavity. Theblunt cone tip 27 also minimizes tenting of the peritoneum and allows for a safe entry. The device is typically used in conjunction with thecannula 12 to create an initial entryway into the peritoneal cavity. Theobturator 18 is first inserted through thevalve housing 16 and into thecannula 12. Theentire trocar system 10 is then inserted through the abdominal wall and into the peritoneal cavity. Once thecannula 12 is properly placed, theobturator 18 can be removed. - The invention facilitates a unique method of penetrating and separating tissue and could apply to any object with a blunt cone tip and generally flat sides. When inserted into the peritoneum the blunt cone tip requires very little area to move safely between tissue and muscle fibers. The device can then be rotated in alternating clockwise and counterclockwise directions while the downward penetration force is applied. When rotated in alternating directions, the tissue is moved apart and a larger opening is created for a profile of greater cross sectional area to follow. This process continues with safety as the device enters the peritoneal cavity and moves to its operative position.
- When the
cannula 12 is ultimately removed, the size of the opening left in the tissue is minimal. Importantly, this opening is left sealed due to a dilating effect caused by the mere separation of fibers. Since there are no blades or sharp edges to cut muscle fiber, the healing process is significantly shortened. - The
obturator 18 can be constructed as a single component or divided into multiple components such as theshaft 21 and theblunt cone tip 27. If theobturator 18 is constructed as a single component, it may be constructed of either disposable or reusable materials. If theobturator 18 is constructed as two or more components, each component can be made either disposable or reusable as desired for a particular configuration. In a preferred embodiment, the obturator is constructed as a single component made from a reusable material such as metal (e.g., stainless steel) or an autoclavable polymer to facilitate re-sterilization. - In another embodiment of the invention, the
blunt cone tip 27 can be coated or otherwise constructed from a soft elastomeric material. In such a case, the material could be a solid elastomer or composite elastomer/polymer. - The
shaft 21 of theobturator 18 could be partially or fully flexible. With this configuration, theobturator 18 could be inserted through a passageway containing one or more curves of virtually any shape. A partially or fully flexedobturator 18 could then be used with aflexible cannula 12 allowing greater access to an associated body cavity. - The
obturator 18 could also be used as an insufflation needle and provided with a passageway and valve to administer carbon dioxide or other insufflation gas to the peritoneal cavity. Theobturator 18 could also be used with an insufflation needle cannula, in which case removal of theobturator 18 upon entry would allow for rapid insufflation of the peritoneal cavity. - It will be understood that many modifications can be made to the disclosed embodiments without departing from the scope of the invention as claimed.
Claims (12)
- A surgical obturator (18) adapted to penetrate at least two consecutive layers of muscle tissue including a first layer of muscle tissue having fibers oriented in a first direction and a second layer of muscle tissue having fibers oriented in a second direction, the obturator comprising:an elongate shaft (21) extending along an axis (23) between a proximal end and a distal end; anda bladeless tip (27) disposed at the distal end of the shaft (21); the tip (27) having an outer surface extending distally to a blunt end (62); the outer surface including a pair of side surfaces (54, 56) separated by intermediate surfaces (50, 52) defining a rectangle (63) in radial cross-sections of the tip (27);wherein the outer surface is configured such that the rectangle at the distal end of the tip is in a more parallel alignment with the second direction of orientation of fibers of the second layer of muscle tissue after penetration of the first layer of muscle tissue along the first direction of orientation of fibers, and wherein the outer surface further includes a conical surface (60) extending distally to the blunt end (62).
- The surgical obturator of claim 1 wherein in successive proximal cross-sections, the rectangle (63) rotates in a first direction.
- The surgical obturator of claim 2 wherein in successive proximal cross-sections, the rectangle (63) then rotates in a second direction.
- The surgical obturator of claim 1 wherein the rectangle (63) comprises a pair of long sides defined by the intermediate surfaces (50, 52) and a pair of short sides defined by the side surfaces (54, 56).
- The surgical obturator of claim 4 wherein in successive proximal cross-sections of the tip (27), a radial line from the axis (23) to a midpoint of one of the short sides rotates about the axis (23) in a first direction.
- The surgical obturator of claim 5 wherein the radial line then rotates about the axis (23) in a second direction opposite to the first direction.
- The surgical obturator of claim 4 wherein the long sides become more arcuate in successive proximal cross-sections of the tip (27).
- The surgical obturator of claim 4 wherein the short sides become more arcuate in successive proximal cross-sections of the tip (27).
- The surgical obturator of claim 1 wherein the width of the rectangle (63) increases in successive proximal cross-sections of the tip (27).
- The surgical obturator of claim 1 wherein the rectangle (63) is twisted along the tip (27).
- The surgical obturator of claim 1 wherein the tip (27) is transparent and the shaft (21) is adapted to receive a laparoscope.
- The surgical obturator of claim 1 further including a passageway for delivering insufflation gas from the proximal end to the distal end.
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US38146902P | 2002-05-16 | 2002-05-16 | |
EP03753017A EP1503677B1 (en) | 2002-05-16 | 2003-05-13 | Cone tip obturator |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP03753017.7 Division | 2003-05-13 |
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EP03753017A Expired - Lifetime EP1503677B1 (en) | 2002-05-16 | 2003-05-13 | Cone tip obturator |
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EP03753017A Expired - Lifetime EP1503677B1 (en) | 2002-05-16 | 2003-05-13 | Cone tip obturator |
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EP (2) | EP2316361B1 (en) |
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2003
- 2003-05-13 EP EP11154547.1A patent/EP2316361B1/en not_active Expired - Lifetime
- 2003-05-13 CA CA002485481A patent/CA2485481A1/en not_active Abandoned
- 2003-05-13 DE DE60337002T patent/DE60337002D1/en not_active Expired - Lifetime
- 2003-05-13 EP EP03753017A patent/EP1503677B1/en not_active Expired - Lifetime
- 2003-05-13 WO PCT/US2003/014924 patent/WO2003096879A2/en active Application Filing
- 2003-05-13 JP JP2004504887A patent/JP2005525860A/en active Pending
- 2003-05-13 US US10/514,313 patent/US7758603B2/en active Active
-
2010
- 2010-07-14 US US12/836,023 patent/US8152828B2/en not_active Expired - Fee Related
-
2012
- 2012-03-02 US US13/411,244 patent/US8608768B2/en not_active Expired - Lifetime
- 2012-08-15 US US13/586,825 patent/US8377090B2/en not_active Expired - Lifetime
-
2013
- 2013-11-18 US US14/082,558 patent/US9545248B2/en not_active Expired - Lifetime
-
2016
- 2016-12-06 US US15/370,122 patent/US10368906B2/en not_active Expired - Lifetime
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2019
- 2019-07-31 US US16/527,547 patent/US11207098B2/en not_active Expired - Lifetime
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US20120316596A1 (en) | 2012-12-13 |
CA2485481A1 (en) | 2003-11-27 |
US20050251191A1 (en) | 2005-11-10 |
US10368906B2 (en) | 2019-08-06 |
US11207098B2 (en) | 2021-12-28 |
EP1503677A4 (en) | 2008-12-31 |
US8152828B2 (en) | 2012-04-10 |
US20100298776A1 (en) | 2010-11-25 |
EP2316361A1 (en) | 2011-05-04 |
US8608768B2 (en) | 2013-12-17 |
US7758603B2 (en) | 2010-07-20 |
US20140121695A1 (en) | 2014-05-01 |
US20170164976A1 (en) | 2017-06-15 |
DE60337002D1 (en) | 2011-06-16 |
EP1503677A2 (en) | 2005-02-09 |
US20160345948A9 (en) | 2016-12-01 |
US9545248B2 (en) | 2017-01-17 |
WO2003096879A2 (en) | 2003-11-27 |
JP2005525860A (en) | 2005-09-02 |
EP1503677B1 (en) | 2011-05-04 |
US20120165852A1 (en) | 2012-06-28 |
US20190350618A1 (en) | 2019-11-21 |
US8377090B2 (en) | 2013-02-19 |
WO2003096879A3 (en) | 2004-01-29 |
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